Texas Instruments TRIS TMS37122 - Figure 13: Overall State Diagram of Control Unit

27
August ’01 Chapter 2. Electrical Description
Figure 13: Overall State Diagram of Control Unit
Off-Mode
(Iquiet)
VRF>VWAKEA
for tWdly
(No_Wake Flag=0)
No modulation
during tWAIT
CLKI = ON
EOBI = ON
DEMOD = ON
Wait max.
for tWAIT
(Iact)
1st. EOBI detected
No valid or complete
WAKE PATTERN
during tWRX
WDEEN
= LOW
WDEEN =
HIGH
Standby-
Mode
VWAKEA=ON
(Istby)
VRF < VWAKEB
VRF > VWAKEB
Receive
Wake Pattern
for max tWRX,
Check
Wake Pattern
(Iact)
EOBI = OFF,
Wait for
tTELEGR
(Iinit)
VRF <
VWAKEA
WDEEN
= LOW
WDEEN
= LOW
TX = LOW and
WDEEN = HIGH
WAKE PATTERN B
received
(Passive Start)
WAKE PATTERN A
received
(Passive Entry)
VWAKEB =
ON
3DSTAT1G.CH4
Transparent M.
Watchd. = OFF
WAKE = High
EOBA = ON
CLKA = ON
(Iact)
CLKI missed
for twdg
tTELEGR
exceeded
CLKI
missed
for
twdg
CLKI =
OFF
TX = HIGH and
WDEEN = HIGH
WAIT
TX=
LOW
TX=
HIGH
TX = LOW
and
WDEEN
=HIGH
TX =HIGH
Transmission
Mode
CLKM=ON,
Start oscillation
WDEEN = LOW
WDEEN
= HIGH
WDEEN = LOW
WDEEN = LOW
VRF>VWAKEA
for tWdly
(No_Wake Flag=1)
CLKI missed
for twdg
CLKI missed
for twdg